Wow that is so cool! Will ffmpeg generate ultrasound sounds to, or do we know of a plugin or other that could do that, then feed the signal to ffmpeg?
Thank you! On Sat, Apr 18, 2020 at 9:48 AM Michael Koch <[email protected]> wrote: > Am 18.04.2020 um 18:25 schrieb Ted Park: > > I don't know where I can find bats nearby so I couldn't try it but how > > does it work? The book makes it sound like you can use any mic, even > > one built into a laptop for this? I suppose that's plausible looking > > at a typical mic's frequency response graph, they are just cut off at > > 20khz, and don't roll off after 20khz like I thought they would, but > > what about the sample rate? At 44.1kHz doesn't that mean anything over > > 22khz is more aliasing or harmonic distortion than an actual recording > > of bat sounds? > > The sounds of those bats that I did record were in the 12kHz to 15kHz > range. 44.1kHz sample rate is sufficient. I did use two Rode NT1 > microphones, connected to a Tascam DR-70D recorder. If I record the > ultrasound in the recorder, I use 48kHz sample rate. If live processing > is required, I connect the Tascam's output to my notebook's audio input, > which has only 44.1kHz sample rate. That works as well. It is important > that you disable the low pass filter in the Windows control panel > (properties of the microphone). > > Michael > > _______________________________________________ > ffmpeg-user mailing list > [email protected] > https://ffmpeg.org/mailman/listinfo/ffmpeg-user > > To unsubscribe, visit link above, or email > [email protected] with subject "unsubscribe". _______________________________________________ ffmpeg-user mailing list [email protected] https://ffmpeg.org/mailman/listinfo/ffmpeg-user To unsubscribe, visit link above, or email [email protected] with subject "unsubscribe".
